13631942821 has 32 divisors (see below), whose sum is σ = 16293150720. Its totient is φ = 11159769600.

The previous prime is 13631942791. The next prime is 13631942879. The reversal of 13631942821 is 12824913631.

It is a happy number.

It is not a de Polignac number, because 13631942821 - 2⁵ = 13631942789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13631942321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10334400 + ... + 10335718.

It is an arithmetic number, because the mean of its divisors is an integer number (509160960).

Almost surely, 2^13631942821 is an apocalyptic number.

It is an amenable number.

13631942821 is a deficient number, since it is larger than the sum of its proper divisors (2661207899).

13631942821 is a wasteful number, since it uses less digits than its factorization.

13631942821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1945.

The product of its digits is 62208, while the sum is 40.

The spelling of 13631942821 in words is "thirteen billion, six hundred thirty-one million, nine hundred forty-two thousand, eight hundred twenty-one".